#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main()
{
	int n = 0;
	int ret = 1;
	int sum = 0;
	int i = 0;
	for (n= 1; n <= 10;n++)
	{
		 
				ret = ret * n;
		
			sum += ret;
		}
	printf("%d\n", sum);
	
		return 0;
}